Improvement in clamp-screws



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CHARLES PARKER, or SAME PLAGE. Y

Letters Patent No.771,885, dated December 10, 18.67, i f

IMPROVEMENT IN CLAMP-SCREWS.

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,Be it known that I, CHARLES L. KINesLnY, of Meriden, in the county of New Haven, and State of Connecticut, have invented a new Improvement in Clamp-Screws; and I do hereby declare the following, when taken in connection with the accompanying drawings, and the letters of reference marked thereon, to be afull,`

clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in

li'iure 1, a front view.4 i I l Figure 2 an under side view looking up, the lever turned up.

Figure 3 a. ,perspective view of the nut detached, and in Figure 4 the handle detached. Y

This invention relates to an improvement Ain clamp-screws, or such as are used for securing vises to abeneh, or the tail-stock and rest to lathes, and for other similar purposes. As heretofore constructed, the nut has been formed as itself apart of a handle, or so as to apply -a detachable wrench thereto whenever it was necessary to adjust the part clamped by the nut. If the handle be fixed, it is often inconvenient to turn the handle, inas` Vmuch as the handle must pass quite around in order to turn thenut around, or if a detachable wrench bc used,

its liability to be out of place, and not at hand when wanted, makes a very serious objection to the detachable wrench.v .A

By my invention these difficulties arc entirely overcome; and my invention consists in forming a. seat, in the two opposite sides of the nut, and constructing a lever, with its end as a yoke, to pass over the nut, and with tiunnions upon the inside of the yoke; so as to set into the seats formed in the nut, and so. that the lever will swing freely in its seat when the nut is placed. upon the screw, so that the lever may be turnedup and serveV as a convenient arrangement forV adjusting the nut.

To enableothers to construct-my improvement, I will proceed to describe the same, as illustrated in the accompanying drawings. W

A represents the thing to be clamped, and B B the lathe shears or bench, or whatever it be that the thing A is to be clamped upon; C, the bolt; D, a washer between the nut E and the bench B. Tlie'nut isupplied to the bolt, and secures the thing A in themsual manner The nut E, Iform with arece'ss, F, upon opposite sides, (see fig. 3,) the recess extending from the top of the nut down towards its lower end, und so that at the end of y the recess F aseat is formed. The lever G is formed with a yoke, H II, so as to set over the nl it, as seen in fig. 3, and upon the inside of the yoke are formed trunnions I I, so as to set into the recess F on the nut, and rest in the seat formed by the said recess. When the nut is placed upon the bolt, the lever is set into its position in the recesses of the nut, and hanging `perfectly free in the seat, the lever drops, ad); seen in iig. Il, and

when the nut is turned up to its place, or to a hearing to tighten the nut, turn up the level', as seen in fig. 2; then the nut may be easily turned or re-turned to loosen and adjust the `thing secured.

This improvement is cheap in its construction, inthat both the nut and the wrench may be constructed froui malleahle iron, and completely formed in moulding.

Having thus fully described my invention, whatI claim as new and useful, and desire to secure by Letters Patent, isi The nut E, formed with the seats F, and the lever Gr, formed with the trunnions I, so as to be combined A and operate in the manner and for thepurpose described, i

, CHAS.`L. KINGSLEY. Witnesses:

J. W. MILES, JOHN PARKER, 

